Postgres integration with asyncio.
Project description
aiopg is a library for accessing a PostgreSQL database from the asyncio (PEP-3156/tulip) framework. It wraps asynchronous features of the Psycopg database driver.
Example
import asyncio from aiopg.pool import create_pool dsn = 'dbname=jetty user=nick password=1234 host=localhost port=5432' @asyncio.coroutine def test_select(): pool = yield from create_pool(dsn) with (yield from pool) as conn: cur = yield from conn.cursor() yield from cur.execute('SELECT 1') ret = yield from cur.fetchone() assert ret == (1,), ret asyncio.get_event_loop().run_until_complete(test_select())
Example of SQLAlchemy optional integration
import asyncio from aiopg.sa import create_engine import sqlalchemy as sa metadata = sa.MetaData() tbl = sa.Table('tbl', metadata, sa.Column('id', sa.Integer, primary_key=True), sa.Column('val', sa.String(255))) @asyncio.coroutine def go(): engine = yield from create_engine(user='aiopg', database='aiopg', host='127.0.0.1', password='passwd') with (yield from engine) as conn: yield from conn.execute(tbl.insert().values(val='abc')) res = yield from conn.execute(tbl.select()) for row in res: print(row.id, row.val) asyncio.get_event_loop().run_until_complete(go())
Please use:
$ python3 runtests.py
for executing project’s unittests
CHANGES
0.8.0 (XXXX-XX-XX)
- Add PostgreSQL notification support #58
- Support pools with unlimited size #59
0.7.0 (2015-04-22)
- Get rid of resource leak on connection failure.
- Report ResourceWarning on non-closed connections.
- Deprecate iteration protocol support in cursor and ResultProxy.
- Release sa connection to pool on connection.close().
0.6.0 (2015-02-03)
- Accept dict, list, tuple, named and positional parameters in SAConnection.execute()
0.5.2 (2014-12-08)
- Minor release, fixes a bug that leaves connection in broken state after cursor.execute() failure.
0.5.1 (2014-10-31)
- Fix a bug for processing transactions in line.
0.5.0 (2014-10-31)
- Add .terminate() to Pool and Engine
- Reimplement connection pool (now pool size cannot be greater than pool.maxsize)
- Add .close() and .wait_closed() to Pool and Engine
- Add minsize, maxsize, size and freesize properties to sa.Engine
- Support echo parameter for logging executed SQL commands
- Connection.close() is not a coroutine (but we keep backward compatibility).
0.4.1 (2014-10-02)
- make cursor iterable
- update docs
0.4.0 (2014-10-02)
- add timeouts for database operations.
- Autoregister psycopg2 support for json data type.
- Support JSON in aiopg.sa
- Support ARRAY in aiopg.sa
- Autoregister hstore support if present in connected DB
- Support HSTORE in aiopg.sa
0.3.2 (2014-07-07)
- change signature to cursor.execute(operation, parameters=None) to follow psycopg2 convention.
0.3.1 (2014-07-04)
- Forward arguments to cursor constructor for pooled connections.
0.3.0 (2014-06-22)
- Allow executing SQLAlchemy DDL statements.
- Fix bug with race conditions on acquiring/releasing connections from pool.
0.2.3 (2014-06-12)
- Fix bug in connection pool.
0.2.2 (2014-06-07)
- Fix bug with passing parameters into SAConnection.execute when executing raw SQL expression.
0.2.1 (2014-05-08)
- Close connection with invalid transaction status on returning to pool.
0.2.0 (2014-05-04)
- Implemented optional support for sqlalchemy functional sql layer.
0.1.0 (2014-04-06)
- Implemented plain connections: connect, Connection, Cursor.
- Implemented database pools: create_pool and Pool.
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